Electron-hole asymmetric magnetotransport of graphene-colloidal quantum dot device

Interfacing graphene with other low-dimensional material has gained attentions recently due to its potential to stimulate new physics and device innovations for optoelectronic and electronic applications. Here, we exploit a solution-processed approach to introduce colloidal quantum dot (CQD) to the bilayer graphene device. The magnetotransport properties of the graphene device is drastically altered due to the presence of the CQD potential, leading to the observation of AB-like oscillation in the quantum Hall regime and screening of the intervalley scattering. The anomalous magnetotransport behavior is attributed to the coulombic scattering introduced by the CQDs and is shown to be highly asymmetric depending on the polarity of the transport carriers. These results prove the potential of such flexible method for engineering microscopic scattering process and performance of the graphene device that may lead to intriguing device application in such hybrid system.

Automated summary

Interfacing graphene with other low-dimensional materials has attracted attention recently due to its potential for new physics and device innovations. In this study, colloidal quantum dots (CQDs) were introduced to a bilayer graphene device using a solution-processed approach. The presence of the CQDs drastically altered the magnetotransport properties of the graphene device, leading to the observation of AB-like oscillation in the quantum Hall regime and screening of intervalley scattering. This study demonstrates the potential of this flexible method for engineering microscopic scattering processes and improving the performance of graphene devices.